176 Notes—Geology and Hymenoptera. 
rendered great assistance in the production of this waiky It 
would be useless to attempt to give any idea of the diversity of 
the plants mentioned in this correspondence, and all interested in 
British Botany may be recommended to read it for themselves. 
W. WEstT, junr- 
NOTE GEOLOGY. 
A Grantham Boulder.—A short time ago an ‘erratic’ was thrown 
out during excavation for the foundation of houses on Green Hill, south- 
west of Grantham. e boulder was nd measure 
os whic n the Lz 
district, -. ra exa able. om ted cott Hill IL. I Gatien: of course, bipcaiare that it. 
came from the Lake Dist 
Any rea sok me ma y be interested in Lincolnshire boulders, may have 
a specimen of the above by applying to—HENRY PRESTON, Grant tham, 
May 1898. , 
—— >> 
NOTE--HYMENOPTERA. 
Osmia rufa Nesting in a Lock.-—The eccentric habits of this pretty 
Sr bee are well known to sialaos of the hy men oper and an interesting 
eu 
e and ppe t 
n all, 43 males and 5 females emerged—a fethavicable discrepancy in 
the sexes. Fifteen specimens failed to emerge, and me Ptr the cocoons 
d 
a month later they were found to be all dead. Of these nine were males, 
five females, and one cocoon contained a dead al ey The nest thus con- 
tained about 52 males and only 10 females. There was no variation among 
: 52 
the specimens, beviotid slight difference in size, and the nest contained no 
asites 
I am not aware if it is generally known that this bee completes its 
metamorphosis before the winter sets in , and passes the winter months in 
the perfect age but it was certainly so in this case, i. 
a th ht 
a partecty-eveloped e specime: opened 
another the same ae ah W ‘Carr, Netting tem, 2nd May 1898. 
